STAR NURSING COLLEGE SUBJECT OBG PRESENTATION ON FETAL SKULL PRESENTED BY MISS MANISHA GUPTA.

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Presentation transcript:

STAR NURSING COLLEGE SUBJECT OBG PRESENTATION ON FETAL SKULL PRESENTED BY MISS MANISHA GUPTA

FETAL SKULL The skull is formed of the face, the vault & the base The bones that form the skull are : two frontal bones, two parietal bones, two temporal bones wings of the sphenoid & occipital bone The bones of the face & base are heavy & fused The bones of the vault are 2 frontal,2 parietal & occipital The bones of the vault are not joined thus changes in the shape of the fetal head during labor can occur due to molding

FETAL SKULL DEFINITIONS Bregma   Ant fontanelle Brow   lies between bregma &root of the nose Face   lies between root of the nose & suborbital ridges Occiput   boney prominence behind post fontanelle Vertex   diamond shaped area between ant & post fontanelles & parietal eminences

FETAL SKULL SUTURES  Frontal suture  between 2 frontal bones  Sagittal suture  between 2 parietal bones  Coronal suture  between parietal & frontal  Lambdoid suture  between parietal & occipital  Temporal suture  between inferior margin of the parietal & temporal

FETAL SKULL FONTANELLES  Anterior fontanelle  diamond shaped space between coronal & sagittal suture 3 * 3 cm, ossifies at 18 m  Post font (lambda)  triangle shaped space between sagittal & lambdoid suture

FETAL SKULL DIAMETERS Suboccipitobregmatic 9.5 cm.  middle of the bregma to undersurface of the occipital bone at the neck The presenting diameter of the well flexed head in labour Suboccipitofrontal 10 cm  root of the nose to undersurface of the occipital bone at the neck The presenting diameter of the partially flexed head. Submento-vertical 11.5 cm  junction of floor of the mouth and neck to the highest point on the sagittal suture

FETAL SKULL DIAMETERS Occipitofrontal 11.5 cm  Root of the noose to the most prominent point of the occiput A defelexed head presents with this diameter Mentovertical 14cm  Chin to most prominent point of the occiput The presenting diameter in brow presentation The largest diameter of the fetal head Submentobregmatic 9.5 cm  Chin to middle of bregma The presenting diameter in face presentation

TRANSVERSE DIAMETER BIPARIETAL 9.5cm Between 2 parietal eminences BITEMPORAL 8 cm Between the antero-inferior ends of the coronal suture SUPER SUB-PARIETAL 8.5 cm Extend from a point placed below one parietal eminence to a point placed above the other parietal eminence of the opposite side. BI-MASTOID DIAMETER 7.5 cm Distance between the tip of the mastoid process.

MOULDING OF THE HEAD  Occurs with descent of the fetal head into the pelvis to reduce the head circumference  Frontal bones slip under parietal bones  Parietal bones override each other  Parietal bones slip under the occipital bone

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